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Visar resultat 1 - 5 av 12 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Morphometry of the Optic Nerve Head as a Diagnostic Tool for Glaucoma

    Författare :Camilla Sandberg Melin; Per Söderberg; Boel Bengtsson; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; optic nerve head; ONH; nerve fibers; glaucoma; optical coherence tomography; OCT; Pigment epithelium central limit-inner limit of the retina minimal distance; PIMD; PIMD-2π; Segmental PIMD-2π; confocal scanning laser tomography; HRT; NRA; variation; variability; variance; loss rate; follow-up.;

    Sammanfattning : Glaucoma is a chronic optic nerve head (ONH) disease. Gradual retinal ganglion cell and nerve fiber loss lead to morphological ONH change and visual field defects. Initial loss is often focal. Rate of progression and life expectancy guide treatment. LÄS MER

  3. 2. Low Secondary Electron Yield Carbon Coatings for Electron Cloud Mitigation in Modern Particle Accelerators

    Författare :Christina Yin Vallgren; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Raman spectroscopy; NRA; amorphous carbon; secondary electron yield; LIU; X-Ray Photoelectron Spectroscopy; SEY; AFM; electron cloud; SPS dipole magnet;

    Sammanfattning : In order to upgrade the Large Hadron Collider (LHC) performance to be oriented towards higher energies and higher intensities in the future, a series of improvementsof the existing LHC injectors is planned to take place over the next few years. Electron cloud effects are expected to be enhanced and play a central role in limiting theperformance of the machines of the CERN complex. LÄS MER

  4. 3. Uptake of and Preference for Nitrate, Ammonium and Amino Acids by Understory Species in Deciduous Forests

    Författare :Magnus Zätterström; Infektionsmedicin; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Soil Science; agricultural hydrology; Lantbrukshydrologi; marklära; Fixation of nitrogen; Kvävefixering; Växtekologi; Plant ecology; wild plants.; understory; rhizosphere; preference; oak forests; NRA; nitrification; nitrate; delta15N; 15N; glutamate; glycine; drying-rewetting; amino acids; ammonium;

    Sammanfattning : AbstractThe uptake of different nitrogen forms by understory species was studied in field and laboratory. Species of the understory in deciduous forests have previously been thought to take up and assimilate only inorganic nitrogen sources. LÄS MER

  5. 4. Investigation of lithium and fluorine content in geological materials using Nuclear Reaction Analysis (NRA)

    Författare :Nathaly de La Rosa; Kärnfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Nuclear reaction analysis NRA ; Geological material; Elemental composition analysis; Ion Beam Analysis IBA ;

    Sammanfattning : This work focuses on the optimization of the Nuclear Reaction Analysis (NRA) technique to determine the content of lithium and fluorine in geological materials. Measuring low concentration of these isotopes is of great relevance in many fields such as geological, astrophysical, biological and material sciences. LÄS MER

  7. 5. Rapid tests for multidrug resistant tuberculosis in low income settings

    Författare :Freddie Bwanga; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Tuberculosis (TB) is at epidemic levels in the resource-limited settings (RLSs) due to HIV/AIDS, poverty and insufficient TB control programmes. These factors are also contributing to TB drug resistance. Patients with multidrug drug resistant tuberculosis (MDR-TB) do not respond to first line drugs. LÄS MER